In a lengthy section of the document describing "race and ethnic code definitions," the regulation stated under the category "Black or African American" that would include, "A person having origins in any of the black racial groups of Africa. Terms such as "Haitian" or "Negro" can be used in addition to "Black" or "African American."
http://www.cnn.com/2014/11/05/politics/army-says-word-negro-ok-to-use/